HY-2 Vocoder, brewbooks’ photostream, flickr, (CC) BY-SA 2.0 Sign reads: First widely deployed device for converting speech into a form compatible for encryption by a general purpose key generator (KG-13) for transmission over narrowband radio and telephone. Affectionately compared to Donald Duck’s voice. Vietnam War era. Hi, amateur cryptographers! Wow, once again, I am the…














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